The　flow　stress　feature　of　aluminum　sheet　used　for　pressure　can　during　plastic　deformation　at　elevated　temperature　was　studied　by　isothermal　compression　test　using　Gleeble　1500　dynamic　materials　testing　machine.　The　experimental　results　show　that　the　steady　state　deformation　is　remarkable　when　the　material　is　deformed　at　350-500°C　with　strain　rates　of　10-2-10.0　s-1.　The　material　is　sensitive　to　positive　strain　rate.　A　hyperbolic　sine　relationship　is　found　to　correlate　well　the　flow　stress　with　the　strain　rate,　and　an　Arrhenius　relationship　with　the　temperature.　Semi-empirical　constitutive　equations　of　flow　stress　are　derived　from　experimental　data　for　tested　material　during　plastic　deformation　at　elevated　temperature　by　polyelement　linear　regression　analysis.